Mac Pro blinks quickly only once

Hi, I have a Mac Pro 2012 and when I try to turn it on, the first 2 LEDs above start a red light, it blinks quickly only once when I try to turn it on.

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crwdns2889612:0crwdne2889612:0 2

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Can you post a video of it?

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@beanman56 right now I don't have the mac, but it's just 1 simple blink, I've already removed the video card memories and it always does the same

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